feat(app): add weekly report exports

[bitloi]

Summary

• Add copy-ready Markdown export support for weekly value reports while preserving the default JSON response.
• Add operator dashboard controls to copy the weekly report as Markdown or JSON.
• Document the new API format option in OpenAPI and cover sanitizer/report export behavior with focused tests.

Closes #251.

Scope

• This PR is focused and does not mix unrelated backend, UI, MCP, docs, dependency, and deploy changes.
• This follows CONTRIBUTING.md and does not reintroduce GitHub Pages, VitePress, site/, or CNAME.
• I linked an issue, or this is small enough that the summary explains why an issue is not needed.

Validation

• git diff --check
• npm run actionlint
• npm run typecheck
• npm run test:coverage locally; global coverage stays at or above 97% for lines, statements, functions, and branches (aim for 98%+ branch coverage locally so small CI variance does not fail near the threshold)
• npm run test:workers
• npm run build:mcp
• npm run test:mcp-pack
• npm run ui:openapi:check
• npm run ui:lint
• npm run ui:typecheck
• npm run ui:build
• npm audit --audit-level=moderate
• New or changed behavior has unit/integration tests for new branches, fallback paths, and sanitizer boundaries

If any required check was skipped, explain why:

• None. npm run test:ci passed locally.

Safety

• No secrets, wallet details, hotkeys, coldkeys, user PATs, private keys, raw trust scores, private rankings, or private maintainer evidence are exposed.
• Public GitHub text stays sanitized, low-noise, and does not imply compensation guarantees or optimization tactics.
• Auth, cookie, CORS, GitHub App, Cloudflare, or session changes include negative-path tests.
• API/OpenAPI/MCP behavior is updated and tested where needed.
• UI changes use live API data or real empty/error/loading states, not production mock/demo fallbacks.
• Visible UI changes include screenshots or a short recording.
• Public docs/changelogs are updated where needed; changelogs are only edited for release-prep PRs.

Notes

• npm run test:ci passed with coverage summary: statements 99%, branches 97.02%, functions 98.19%, lines 99.59%.
• API contract updated for GET /v1/app/analytics/weekly-value-report?format=markdown with text/markdown response support.
• Screenshot evidence for the operator export controls:

Screenshots

Operator weekly report export controls

[JSONbored]

@bitloi thanks for the PR, can you please fix merge conflicts?

Also, moving forward, screenshots should be added to the original PR description as small thumbnails with a caption above or below each one, please, so i can quickly preview them.

Thanks 👍🏻

[JSONbored]

@bitloi

A few notes:

• The Markdown/JSON export path is useful and matches #251: operators and maintainers can now copy a weekly value report instead of only inspecting dashboard state.
• The API keeps operator-only detail behind the operator variant, and the Markdown formatter redacts the right classes of unsafe terms.
• Screenshot evidence is now attached in the PR body, which satisfies the visible UI review requirement (although it's in SVG format and when clicked, appears as a broken image, so next time please use jpg/png only).

No code changes requested.